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81.
Urban Ecosystems - Urban environments have become an unexpected and promising avenue for pollinator conservation. One group of pollinators, bumble bees, might be especially well suited to utilize... 相似文献
82.
83.
Theory and Decision - We build a multiple hierarchical model of a representative democracy in which citizens elect ward representatives, ward representatives elect county representatives, county... 相似文献
84.
Despite the implications for human immunodeficiency virus (HIV) prevention and sexual health, little is known about the timing and chronological order of when same-sex male couples disclose their HIV serostatus, establish a sexual agreement, and first engage in condomless anal sex (CAS) in their relationships. Dyadic data from 357 dyads were used to describe when these respective events occurred; whether members of a couple concurred about when the events happened; and the chronological order of these events. For many, disclosure and CAS happened within the first month, whereas an agreement tended to occur much later (if at all). Couples’ concordance of when disclosure and agreement formation happened differed by their serostatus, whereas there was little difference by serostatus for CAS. The chronological order of these events revealed interesting patterns and varied substantially. Although two-thirds of partners reported disclosure had occurred first, some reported events happening on the same day. These findings reveal that the first few months in a same-sex male couple’s relationship is a critical time period for when information and decisions about sexual health occur. Suggestions are provided for how current and future HIV prevention efforts could assist couples with their sexual health needs. 相似文献
85.
Calvin D. Croy Marjorie Bezdek Christina M. Mitchell Paul Spicer 《Population research and policy review》2009,28(5):641-660
We evaluated how ambitions, community ties, monetary sufficiency, employment, and alcohol consumption related to whether young
American Indian adults had moved from their Northern Plains reservation. Of 518 Northern Plains reservation residents in 1993,
we located 472 in 2003–2005 and found that 89 lived more than a four-hour drive from the reservation. Coding the 472 as to
whether they had stayed on/near the reservation or moved away, we ran logistic regressions on data they reported in 1996 to
determine which demographic and attitudinal variables were associated with having moved. We found ambitions and goals were
more associated with moving away than were ties to the community, which in turn were more related than monetary and personal
characteristics that promote independence and prosperity. The more importance they placed on getting a good education or carrying
on the tribe’s traditions, the more likely they were to have moved away. We found too that the odds of moving away decreased
with greater alcohol consumption. Tribal council members and college administrators therefore may wish to promote policies
that increase opportunities for young adults to achieve higher education goals while remaining on reservation to carry on
tribal traditions. Benefits may also come from encouraging and assisting reservation members studying off-reservation to return
after completing their education. These findings would argue too for greater investment in alcohol services for reservation-dwelling
populations. 相似文献
86.
87.
Christina M. Mitchell Nancy Rumbaugh Whitesell Paul Spicer Janette Beals Carol E. Kaufman 《Journal of research on adolescence》2007,17(2):387-412
Approximately 3 million teens are diagnosed with a sexually transmitted disease (STD) annually; STDs rates for American Indian young adults are among the highest of any racial/ethnic group. An important risk factor for STDs is early initiation of sex. In this study, we examined risk for early initiation with 474 American Indian youth ages 14–18, using 11 risk factors from three developmentally important microsystems (family, school, peers) along with several individual characteristics; a cumulative risk index was also calculated. Discrete‐time survival analyses showed that predictors of early initiation differed by gender. For young men, younger initiation of sex was predicted by lower grades, liking school less, having peers with less prosocial attitudes, a greater likelihood of having used alcohol or drugs at first sex, and having higher sensation‐seeking. For young women, earlier initiation was related to having mothers who had their first child at an early age and who had less formal education, to having parents who had divorced, dropping out of high school, using alcohol/drugs at first sex, and higher sensation‐seeking. Higher cumulative risk was associated with elevated risk of sexual initiation, although the degree of added risk varied with age for women. Cumulative risk deserves broader attention in understanding the early initiation of sexual intercourse. 相似文献
88.
During the 2008 presidential primary campaign, the supporters of Senators Clinton, McCain, and Obama made a number of controversial public statements. After these remarks became public and a focus of media attention, the candidates and their surrogates/supporters engaged in what we term apologia of association. This study examines this previously unexplored apologetic form. 相似文献
89.
ABSTRACTA long-standing puzzle in macroeconomic forecasting has been that a wide variety of multivariate models have struggled to out-predict univariate models consistently. We seek an explanation for this puzzle in terms of population properties. We derive bounds for the predictive R2 of the true, but unknown, multivariate model from univariate ARMA parameters alone. These bounds can be quite tight, implying little forecasting gain even if we knew the true multivariate model. We illustrate using CPI inflation data. Supplementary materials for this article are available online. 相似文献
90.